The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

3.2.2 About Oracle Yum Server

Oracle also provides all errata and updates for Oracle Linux via the Oracle Yum Server service, which includes updates to the base distribution, but does not include Oracle-specific software. You do not require an Oracle Linux support subscription to use this service. For more information on how to obtain updates from Oracle Yum Server, see https://yum.oracle.com.

By default, all new installations of Oracle Linux 6 Update 4 are automatically configured to use the Oracle Yum Server update service. If you subsequently register the system with ULN, the Oracle Yum Server service is automatically disabled.

The following entries in the /etc/yum.repos.d/public-yum-ol6.repo file enable you to download the latest available packages for Oracle Linux 6 and the Unbreakable Enterprise Kernel Release 2:

[ol6_latest]
name=Oracle Linux $releasever Latest ($basearch)
baseurl=https://yum.oracle.com/repo/OracleLinux/OL6/latest/$basearch/
gpgkey=https://yum.oracle.com/RPM-GPG-KEY-oracle-ol6
gpgcheck=1
enabled=1

[ol6_UEK_latest]
name=Latest Unbreakable Enterprise Kernel for Oracle Linux $releasever ($basearch)
baseurl=https://yum.oracle.com/repo/OracleLinux/OL6/UEK/latest/$basearch/
gpgkey=https://yum.oracle.com/RPM-GPG-KEY-oracle-ol6
gpgcheck=1
enabled=1